[vtkusers] How to extract vtkImageData from vtkDICOMImageReader

[Xiaofeng Z]

Thanks for your reply.  I also found out that if I first create a 
vtkImageData object and pass it into vtkDICOMImageReader for it to use 
as output, the vtkImageData object will retain itself when 
vtkDICOMImageReader is deleted:



vtkImageData* image = vtkImageData::New();

reader.SetOutput(image);

...



Is this a safe way to do?



Thanks!

Xiaofeng




Date: Sun, 21 Mar 2010 13:11:50 +0900
Subject: Re: [vtkusers] How to extract vtkImageData from vtkDICOMImageReader
From: wangjunchen at gmail.com
To: xf10036 at hotmail.com; vtkusers at vtk.org

because when you delete the reader, the imagedate(reader->GetOutput()) has a reference count 0 , so it is also recycled. 
if you want to pertain the output of the reader, you can do either:
1. connect the output to the vtk pipeline

or 
2.  vtkImageData * img = vtkImageData::New();
    img->DeepCopy(reader->GetOutput());
    reader->Delete();
    // then you can access to the img...


2010/3/21 Xiaofeng Z <xf10036 at hotmail.com>


Hello,

I use vtkDICOMImageReader to load a CT series:

vtkDICOMImageReader* reader = vtkDICOMImageReader::New();
reader.SetDirectoryName("...");
reader->Update();
vtkImageData* image = reader->GetOutput();


I was able to load the CT series without issue.  The problem is as soon as I call reader::Delete(), the data in "image" appeared to be wiped out.  Is there anyway to retain the vtkImageData object without having to keep the vtkDICOMImageReader object?


Thanks!

Xiaofeng Zhao






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